Ryan, 36, already has two children — Ava, 11, Deacon, 7 — with his ex-wife Reese Witherspoon, but he may become a father again.

Alexis and Ryan dated on and off last year for several months before splitting in September.

“She’s in the second trimester,” a source close to Alexis tells OK!. “Alexis has told friends that the child is Ryan’s.”

“Ryan doesn’t know if he is the father and will want a paternity test,” a second source close to the star explains to OK!. “He will take full responsibility for the child if he is, in fact, the father.”